Tube coupling



FIG. 1 is a front perspective view of a tube coupling showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevation view thereof, the left side elevation view being identical to the right side elevation view; and,

FIG. 5 is a top plan view thereof, the bottom plan view being identical to the top plan view.

In the drawings, the broken lines illustrate portions of the article and form no part of the claimed design.

The ornamental design for a tube coupling having projections extending radially therefrom. 

CLAIM We claim the ornamental design for a tube coupling, as shown and described. 